A plumbing contractor is reviewing the project specifications for a new commercial building that will house a dialysis clinic. The plans indicate a high-hazard cross-connection scenario between the potable water supply and the clinic's specialized water treatment system. According to plumbing codes, which type of backflow prevention assembly is typically required for severe health hazards?
- ADouble Check Valve Assembly (DCVA)
- BAtmospheric Vacuum Breaker (AVB)
- CReduced Pressure Principle Backflow Preventer (RPBA)
- DPressure Vacuum Breaker (PVB)
Show answer & explanationAnswer & explanation
Correct answer: C. Reduced Pressure Principle Backflow Preventer (RPBA)
For severe health hazards, such as those found in dialysis clinics or chemical processing facilities, plumbing codes universally require a Reduced Pressure Principle Backflow Preventer (RPBA). The RPBA provides the highest level of protection by incorporating dual check valves, a hydraulically operated relief valve in the middle, and an air gap if the relief valve opens, ensuring that contaminated water cannot enter the potable supply.
Why the other options are wrong
- A. DCVAs are suitable for non-health hazards but not for severe health hazards.
- B. AVBs are for non-health hazards where there is no backpressure and continuous pressure, and are not suitable for severe health hazards.
- D. PVBs are suitable for non-health hazards where backpressure is not a concern, but not for severe health hazards.
Cross-Connection Control (Severe Hazard)
The implementation of specific backflow prevention assemblies, such as a Reduced Pressure Principle Backflow Preventer (RPBA), to protect the potable water supply from contamination by substances posing a severe health risk.
- Severe hazards can cause illness or death.
- RPBAs are the highest level of mechanical backflow protection.
- Required in applications like medical facilities, chemical plants, and wastewater treatment.
Memory trick: Severe hazard? Only an RPBA can truly guard, protecting health with its strong, layered ward.